docs: def get_config(self, config_filename):
          """
          Collection all config file in all available apps, and merge them into ini object
          :return: ini object
          """
          x = pyini.Ini(lazy=True, basepath=os.path.join(self.project_dir, 'apps'))
          for p in reversed(self.apps):
              app_path = get_app_dir(p)
              filename = os.path.join(app_path, config_filename)
              if os.path.exists(filename):
                  x.read(filename)
  
          x.freeze()
          return x